I do 60% minimum on all tanks. It's not unheard of to do up to 90% weekly
Bichirs are a no go with anything under 6-8" unless really stocky fish
If anything like my chalceus I had then 4ft is minimum for those. They really zipWait a minute lad, which barracuda are you thinking about? I'm talking about the little Acestrorhynchus Isalinae that are reported to get about 4-6 inches. Not their larger name-sharing cousins Ctenolucius hujeta that get ~14 inches.
Bichirs are a no go with anything under 6-8" unless really stocky fish
